Oscillating-current generator.



L. DE FOREST.

OSGILLATING CURRENT GENERATOR. APPL ICATION FILED SEPT. 14' 19H.

7 1,201,270. v Pat entd 0@t-.'1 7,1916.'

. I i I l l l l l l l l UNITED STATES PATENT ouEIoE.

LEE DE FOREST, OF NEW YORK, N. Y., ASSIGNOR TO. DE FOREST RADIO TELEPHONE AND TELEGRAPH COMPANY OI NEW YORK, N, Y., A CORPORATION OF DELAWARE.

osexnLnrms-cnnnan'r eENEnAr'oE.

To all whom it may concern Be it known that I, LEE DE FOREST, a citi- 'zen of the United States, and residing at means which are simple and eflicient or gencrating oscillating currents. n

' A further object of the invention is to increase the oscillation energy of currents gen- 15 erated.

Other objects of my invention will appear more fully hereinafter. 7

,My invention consists substantiallyjn the construction, combination, location, and relative arrangement of parts and circuits all as will be more fully hereinafter set forth,

as shownby the accompanying drawing, and

finally pointed out in the appended claims. Referring to the drawing, Figure 1 shows an oscillating currentgenerator embodying my invention as applied to a radiating antenna system; Fig. 2 shows a 'modified'form of audion generator. Fig. 3 shows an arrangem'ent e'mploymg a reslstance connected up in the circuit of the grid element of the v v 18 of E. M. F. 1s connected through the adaudion.

In accordance with the principles of my invention, I propose to employ an audion consisting of. the usual wing, grid and fila- .ment elements inclosed within an evacuated,

vessel, and suitably associatedcircuits and current sources, to generate oscillating currents, and to increase the oscillation energy .of the currents thus generated, by means of a non-inductive resistance, or a non inductive res stance and a capaclty arranged in sultable relatlon to each other and to the circuits of the above mentioned audion elesist's-of an evacuated vessel 3, in which are inclosed the electrode members 4, 5, 6. f The electrode member 4 I term the hot electrode,

which, in'thisinstance, is in the form of an incandescent body or filament.

The electrode member 5, is in the form of cold plates,

Specification of Letters Patent.

Patented 0a. 17, 1916.'

Application filed September 14, 1914. Serial No. 861,711.

preferably of metal; and I have found that nickelplates well answer-the desired purpose. The electrode member 6 is in the form of grids and of suitable material and formation. In the particular arrangement shown in Fig. 1, towhich, however, my.invention is not to be limited or restricted, I employ two plates to form the electrode 5,

and two grids to form the member 6, andpreferably each grid is interposed in the space between the member Land a plate of member 5.

In. Fig. 2, I have shown as'an embodiment of my in ention, an audion in which a single grid 7 and a single plate 8, are employed, the grid being interposed between the plate and the filament 9.

The incandescent body or filament 4, 9, may be supplied with'current from any suitable or convenient source. I have shown a battery 10, 11 for this purpose. The current supply in the circuit of the filament may be controlled in any suitable or convenient manner, as, for instance, by means of an ad'- justable rheostat or resistance indicated at 12. 1 Reference numeral 13 indicates a source of E. M. F. preferably of high voltage, which may be regulated in any convenient manner by means of the adjustable switch or con-- nection 14. The positive side of the source j ustable connectionle to the audion element or plate members 5, Fig. 1, or 8, F ig. 2. The

negative side of'the E. M. Frsource is connected to one'side of the circuit of filament 4, 9.

Reference numeral 15 indicates an in and condenser together with the,.;a udion forming an oscillating. system. The in-- a minimum dampingeffe'ct and distributed capaclty.

.I have found that the presence of avper- Y manent positive charge of electro-motive force on the grid element ofthe audion reduces the intensity of the oscillations set up by the system.. Therefore it is important ductance, one terminal of which isconnected the variable condenser 16, said'i inductance I ductance 15 should be so designed as to have to effectually insulate the grid' from the positive side of the. electro-motive force source 13. To accomplish this I prefer to insert'a,blocking condenser 18, in the circuit connection of the inductance 15 with the grid element of the audion.

An audion system such as above described forms :an oscillation generator of exceeding simplicity and wherein oscillations are generated in the system 5 (or 8), 15, 16, 18, 6 (or 7 I have discovered, however, that by connecting the audion grid system to one side of the current source 10 which supplies current to the filament, or to the negative side of the flux or electr'o-motive force source 13, through a very high and preferably non-inductive resistance 19, the energy of the oscillations generated in the audioninductance-capacity' system is enormously increased, for example, from the order of a micro-watt to that of tens or hundreds of watts. The resistance 19, should be made adjustable, but its optimum value is not critical. I have also discovered that a still further increase in oscillation energy isobtained if a small capacity, such as a variable condenser 20 is connected in parallel to the resistance 19.

I am at present unable to offer a satisfactory scientific explanation of the action which takes place in a system such as I have described. I have discovered however by actual experience, that an enormous increase in oscillation energy is secured when the resistance 19, either alone or with the capacity 20 is employed and coupled up in the manner and relation set forth. In this connection I wish it to be understood that when I specify a resistance coupled up as shown and described, I wish to include also the use of a capacity coupled-up in parallel thereto for the desired purpose.-

Oscillations generated as above described may be utilized for any purpose for ,which they are adapted. I have shown'the generating system associated with a radiating antenna system which, for illustrative pur poses I have 21 connected to earth at 22, and with which is inductively associated the oscillating system through the inductance l5, and coil 23, respectively forming the primary and secondary /of a transformer the secondary 23 being included in the circuit of the ane l I To attain the best results the radiating system should be in tune with the oscillating system.

Having now set forth the objects and nature of my invention and arrangement em bodying the principles thereof, what I claim as new and useful and of my own inven- 1. In an oscillation genefitor system, the combination with anormally oscillating shown in the form of an aerial audion having three terminals, and a resistance connected between two of the terminals of said audion.

2. In an oscillation generator system, the

combination with a normally oscillating' audion, and a resistance connected between the elements of said audion, and a capacity I connected inparallel to said resistance.

In an oscillation generator system, the combination with a normally oscillating audion, having three electrode members and a resistance connected between two of'the electrode members.

t. In an oscillation generator system, the combination with a normally oscillating audion, having three electrode members and a resistance connected between two of the electrode members, and a capacity connect ed in parallel to said resistance.

5. In an oscillation generator system, the combination with a normally oscillating audion having three terminal elements and a non-inductive resistance connected between two of the elements of the audion.

6. In an oscillation generator system, the

combination with a normally oscillating audion having, three electrode members and a non-inductive resistance connected between two of the electrode members.

7. An oscillation generator system including an audion having plate, grid and filament elements, and circuit connections therefor, a resistance-connected between the grid and filament members and an out-put circuit forthe generated oscillations.

8. An oscillation generator system including an audion having plate, grid and filament elements, and circuit connections'therefor, a non-inductive resistance connected between the grid and filament members and;

an out-put circuit for the generated oscillations.

9. An oscillation generator system including awork circuit, and means for feeding said work circuit including an audion having plate, grid and filament elements, and

circuit connections therefor, and a resistment members, and a capacity connected in parallel to the resistance.

10. An oscillation generator system including an audion having plate, grid and filament elements, an inductance having its terminals respectively connectedto thegrid and plateelements and constituting the output circuit for the generated oscillations, a

force,

11. An oscillation generator system including an audion having plate, grid and filament elements, an inductance having its ance connected between the grid and filacapacity connected'across said terminals, a source of electro-motive force-for the plate elementfa source oi current supply for the filament, and a blocking capacity in the terrlinal connection of the inductance and grl 12. An oscillation generator system including an audion having plate, grid and filament elements, an inductance having its terminals respectively connected to the grid and plate elements and constituting the out- 'put circuit for-the generated oscillations, a

put circuit for the generated oscillations, a capacity connected across said terminals, a source of electro-motive force for the plate v element, a source of current supply for the and filament, and a capacity in parallel to the resistance.

14. An oscillation generator system including an audion having plate and grid ele- -ments, and a heated element, and a resistance connected at its terminals directly to the grid and heated element:

15. An oscillation generator 1 system in.- cluding an evacuated vessel, cold electrodes and a heated electrode inclosed therein, and an external resistance connected at its terminals directly to the heated and one of the cold electrodes.

16. An oscillation generator system including'an audion having plate and grid elements and a heated'element, and a resistance connected at its terminals directly to the grid and heated element and a capacity connected in parallel to said resistance.

In testimony whereof have hereunto set myhand in the presence of the subscribing witnesses, on this 11th day of September A. D., 1914. v y

LEE on FOREST.

Witnesses:

SAMUEL G. DARBY, J r., WALTER A. DARBY.

DISCLAIMER. 1,201,270.-Le d'e Foreat, Ngw York, N. Y. Oacmmmo-Gomu'r Patent dntpd Ocfioben 17 5 1916. Disclaimer filed Deobmber 29, 1922, by tha assignae, Dolor-est Badtb Telephone c6 Telegraph Oompaovy. Hereby mm this disclaimar'bo that pm of the claim in said specification which is in the follnwing words, to wit:

5. In 'an oscillation generator svstem,- the oombinafioli with a. normally osnilhting audion having thme terminal eiements and a non-induotivo ce connected between two of the elements of the audion. l

6. In an oscillation generator system, the combination with a normally qsclllating audion having three electrode mmbers and l non-inductive resistnnoa connocbed betwe'an two of the electrode membens.

[Ofiz'aial Gazette January 16', 1993.] 

